C-Reactive Protein (CRP)
Label Mnemonic: CRP
Epic Lab Code: LAB149
Downtime Form: A-1a General Laboratory Requisition
Chemistry
6240 RCP
356-3527
Specimen(s):
Plasma
Collection Medium:
Plasma Separator Tube 4.5 mL
Alternate Collection Media:
Call laboratory for additional acceptable specimen collection containers.
Minimum:
3 mL whole blood from light green top tube or 1 light green Microtainer® for pediatric patients
Testing Schedule:
24 hrs/day, 7 days a week, including holidays.
Turn Around Time:
1 hour (upon receipt in laboratory)
Reference Range:
<0.5 mg/dL
Comments:
Refer to BD Microtainer® Tubes product sheet for detailed sample collection instructions.
Test Limitations:
Criterion: Recovery within plus or minus 10% of initial values. Icterus: No significant interference up to an I index of 60 (approximate conjugated and unconjugated bilirubin concentration: 60 mg/dL or 1026 μmol/l). Hemolysis: No significant interference up to an H index of 1000. (approximate hemoglobin concentration: 1000 mg/dL). Lipemia (Intralipid): No significant interference up to an L index of 1000 (approximate triglyceride concentration: 2000 mg/dL or 22.8 mmol/l). There is poor correlation between turbidity and triglyceride concentration. Rheumatoid factors less than 1200 IU/mL do not interfere. A high-dose hook effect may occur at CRP concentrations greater than 50 mg/dL. Significantly decreased CRP values may be obtained from samples taken from patients who have been treated with carboxypenicillins.
Methodology:
Immunoturbidimetric
CPT Code:
86140
 
See also:
C-Reactive Protein-Other, Body Fluid